Cam 1 rotates about fixed axis A and has two concentric circular grooves a and b. Follower 3 reciprocates in fixed guide C and carries roller 2 which rolls and slides alternately in grooves a and b. A full cycle corresponds to two revolutions of cam 1 during each of which follower 3 dwells in one of its extreme positions determined by grooves a and b. Roller 2 is switched over from groove a to groove b by profiled switching member 4 which is turned by roller 2 about axis D so that it connects groove a to groove b. At this point, lug c of member 4 runs up against pin d. The roller is switched over from groove b to groove a by profiled switching member 5 which operates similar to member 4.
$3092$SmC,ML$